Mass Transit - 37

POWER SUPPLY
DMU. Additionally, Alstom says
the train consumes less energy
during operations with its flexible energy storage and intelligent
energy management systems.
Alstom's Hesop was developed
to address energy production and
recovery. Hesop is a reversible
substation, which allows for the
recovery of more than 99 percent of available energy during
braking for reinjection into the
electric network.
"Hesop not only provides high
quality energy, it also provides
dynamic voltage regulation to optimize power use in traction mode
and allows for better in-tunnel air
quality as braking dust is reduced.
In additional to its energy recovering capability, on existing networks
Hesop also allows operators to increase traffic density up to 40 percent with the same number of sub-

stations," explained the company.
Hesop is in use in Paris, London, Milan, Sydney, Panama and
Riyadh. Alstom explains that the
Arriyadh Development Authority (ADA) of Riyadh chose Hesop
to remove the need for on-board
braking resistors and to optimize
the power supply architecture of the
system. Under the terms of the contract with ADA, Alstom supplied 35
bi-group substations or 70 Hesop
substations over the 72.7 km (45.17
miles) of lines servicing 32 stations.
Catenary-less solutions, such
as ground-level dynamic feeding (APS), ground-level static
charging (SRS) with ecopacks
and batteries, are manufactured
by Alstom to provide the same
power but better aesthetics.
"These off-wire systems provide
the same performance as wire systems for a better integration into

HESOP
Allows for
the recovery
of more than

99%

of available
energy during
braking for
reinjection into
the electric
network.

the urban environment, a factor
that is particularly expressed by
and important to light rail and
streetcar operators who wish to
minimize the visual impact caused
by overhead lines and poles, as
these types of rail systems tend to
traverse historical areas and city
centers," said Alstom.
Alstom's off-wire systems have
been deployed in Bordeaux, Nice
and Reims in France; Dubai, UAE;
Sydney, Australia and Lusail, Qatar.

Understanding system
and client needs

Burns Engineering offers a range
of specialized engineering solutions to help maintain, improve
and expand transit systems including AC and DC traction power systems. Burns explains that
tight capital dollars are producing
work calling for the rehabilitation

For more information, visit www.MassTransitmag.com/11211076
APRIL/MAY 2019 | MassTransitmag.com | Mass Transit |

37


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Mass Transit

Table of Contents for the Digital Edition of Mass Transit

Ad Index
Editor's Notebook - Showing, as Well as Telling
People and Places
Transit as a Community Affair
U.S. Bus Fleets Report
Forming Paratransit Partnerships Through Alternative Methods
Rail Systems Get Powered Up
Operating a Self Driving City
Best Practices - Deployment of Hydrogen Fuel Cell Buses
Products - In Focus: Buses and Components
Classifieds
Social Hubs - Transit Post Highlights From Around the Web
Mass Transit - 1
Mass Transit - 2
Mass Transit - 3
Mass Transit - 4
Mass Transit - 5
Mass Transit - Ad Index
Mass Transit - 7
Mass Transit - Editor's Notebook - Showing, as Well as Telling
Mass Transit - 9
Mass Transit - People and Places
Mass Transit - 11
Mass Transit - Transit as a Community Affair
Mass Transit - 13
Mass Transit - 14
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Mass Transit - U.S. Bus Fleets Report
Mass Transit - 23
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Mass Transit - 27
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Mass Transit - Forming Paratransit Partnerships Through Alternative Methods
Mass Transit - 31
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Mass Transit - Rail Systems Get Powered Up
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Mass Transit - Operating a Self Driving City
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Mass Transit - 45
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Mass Transit - Best Practices - Deployment of Hydrogen Fuel Cell Buses
Mass Transit - Classifieds
Mass Transit - 49
Mass Transit - Social Hubs - Transit Post Highlights From Around the Web
Mass Transit - 51
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